|
Marketable Securities - (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
securities
|
Jun. 30, 2011
|
Jun. 30, 2012
securities
|
Jun. 30, 2011
commercial_mortgage-backed_securities
|
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Number of commercial mortgage backed securities sold (in securities) | 6 | |||
| Proceeds from sale of marketable securities | $ 0 | $ 82,061 | ||
| Marketable Securities, Gain (Loss) | $ 0 | $ 7,728 | $ 0 | $ 15,587 |
| Number of commercial mortgage backed securities (in securities) | 0 | 0 | ||